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Em-107 Visible Light Receiver Turn on a motor, light, sound module or whatever you can dream up. Activate with a hand clap or any loud noise. Add as a remote control to toys. Possibilities are limited only by your imagination. Powered by two AA batteries (not included) or by 3 volt power supply. This kit includes illustrated instructions, battery holder, power switch, microphone PCB and all parts. Size is 1.6" X 1.2" X 0.5" Turn on a 3 to 6 Vdc 0.5A motor or light.